Ok heres my problem, i hear a rattle from the time my car is started, to the time i turn it off, its coming from the front of the engine, around the alternator, water pump, front of the oil pan, waterpump , cat ect. also i get a check engine light after driving my car about 10minutes, sooner if the cars been ran and i crank it back up. its a 91 wagon w/ the 3.0, any suggestions? im stumped. Also the rattle really dont change w/ the rpms, it does increase some, but not much when the engines reved.